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The Unity desktop that the recent releases of Ubuntu uses is kind of nice overall, but there are some specific things that are really hard to do, one of which is finding and focussing on one window of a particular type of application when you may have many other windows of that application you are not interested in. For example, a lot of the time I have three browser windows, a few gedit editors and around ten terminal windows open. When I am doing something I am normally interested in one browser window, one editor and one terminal. If I want to move from the browser to the terminal I am interested in I don’t want the other 9 terminals popping up over the browser, I only want the one that relates to that browser(From author).
What kind of makes sense to me is that you should be able to right click on the things in the launcher and see the list of windows and choose the one you want. Luckily Unity is quite extensible, there are APIs for adding quicklists to the launcher icons and there is enough information kicking about in dbus to find the window names and get callbacks to happen when things get updated like a window title changes or a window gets added or removed.
Install window quicklists in ubuntu 12.04

It really should be made clear in the article that this is just for 12.04.
You said “recent releases”,suggesting at least the current release should be supported by your instructions. The newest release IS 11.10 as 12.04 is in beta and NOT released yet.
No wonder you’re getting comments from people having problems.